Improvement in vapqr-enxines



t Mg Wig w/zz UNITED STATES? PATENT OFFICE,

JOHN F. HASKINS, OF FITGHBURG, MASSACHUSETTS.

IMPROVEMENT IN VAPOR-ENGINES.

Specification forming part of Letters Patent No. 13?,200, dated Manh 25, 1873.

To all whom it may concern:

Be it known that I, JOHN F. HASKINS, of Fitchburg, in the county of Worcester and State of Massachusetts, have invented an Improvement in Vapor-Engines 5 and I do hereby declare that the following, taken in connection with the drawing which accompanies and forms part of this specification, is a description of my invention suflicient to enable those skilled in the art to practice it.

United States Letters Patent No. 129,337, dated July 16, 1872, have been granted to me for an improvement in air and gas engines, the improvement relating to such engines as have the motive power produced by the use of steam or vapor of water and of a vapor evolved from a highly volatile liquid heated by exhaust from the engine, or the direct steam from the boiler, l

In such patent I show a single engine whose piston is driven by the two vaporsin one direction by the vapor from water, and in the opposite direction by the vapor from the volatile liquid-generated by the heat of the exhaust steam or water vapor, the invention claimed in such patent being in effect an engine having its piston actuated by the pressure of ordinary steam upon one side of it, and by the pressure upon its opposite side of a vapor generated from a highly volatile liquid bymeans of the exhaust steam.

In my present invention I make the cylinder with a double-headed piston, one head working in one part of the cylinder, and the other head in the other part of the, cylinder, the two heads being of difi'erent diameters, and the two parts of the cylinder oi correspondinglydifferent diameters, (for the respective vapors,) and the two parts of the cylinder being separated by an annular recess, which receives the liquid condensed from the upper part of the cylinder, and prevents such liquid from cooling the piston-head of the lower part of the cylinder, it being drawn off by a suitable pump or other device or connection for that purpose.

The two heads are connected by a suitable rod; and my invention consists'in the engine made with the elongated and two-part cylinder for the two piston-heads in the condense recess between the two parts of the cylinder, and in the piston made with. the two heads of varying diameter, connected by the central rod.

The drawing represents a sectional elevation of the engine or en gine-cylinder, the engine being of the upright variety, and the shaft-connection and valve mechanism not be ing shown, as they are not material to the description of the invention.

a denotes the lower part of the cylinder; 1), the upper part thereof, the piston being forced upward by pressure of steam admitted into the lower part of the cylinder under the pie ton, and downward by the pressure of the vapor formed from the volatile liquid, and admitted to the upper part of the cylinder over the piston. 0 denotes a ring encircling and connecting the two parts of the cylinder, this ring havvin g within it an annular recess, 01, so arranged as to catch the water of condensation formed in the upper part of the cylinder. In the upper part of the cylinder is the piston-head c,

and in the lower part of the cylinder is the other head, f. 9 denotes the rod or stem connecting the two heads, the space around this rod and between the heads constituting a packing-space. Now, as the vapor in the upper part of the cylinder condenses, it will drop down into the recess (1, from whence it may be drawn through the escape-pipe h, without opportunity of reaching or cooling the piston'head f. Without this recess the arrangement of the cylinder and of the piston in two parts is a good one for this class of engine, but the condense recess enhances the power and value of the engine.

I claim-- The cylinder made with the two pistonspaces a b, having between them the condense recess cl, substantially as shown and described.

JOHN 13. HASKINS. Witnesses:

FRANCIS GoULn, M. W, Faornmenar 

